/*
 * Copyright 2002-2007 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package uk.org.toot.midi.sequencer;

import javax.sound.midi.*;

/**
 * an optimized ShortMessage that does not need an array
 *
 * @author Florian Bomers
 */
class FastShortMessage extends ShortMessage {
	private int packedMsg;

	public FastShortMessage(int packedMsg) throws InvalidMidiDataException {
		this.packedMsg = packedMsg;
		getDataLength(packedMsg & 0xFF); // to check for validity
	}

	/** Creates a FastShortMessage from this ShortMessage */
	public FastShortMessage(ShortMessage msg) {
		this.packedMsg = msg.getStatus()
		| (msg.getData1() << 8)
		| (msg.getData2() << 16);
	}

	int getPackedMsg() {
		return packedMsg;
	}

	public byte[] getMessage() {
		int length = 0;
		try {
			// fix for bug 4851018: MidiMessage.getLength and .getData return wrong values
			// fix for bug 4890405: Reading MidiMessage byte array fails in 1.4.2
			length = getDataLength(packedMsg & 0xFF) + 1;
		} catch (InvalidMidiDataException imde) {
			// should never happen
		}
		byte[] returnedArray = new byte[length];
		if (length>0) {
			returnedArray[0] = (byte) (packedMsg & 0xFF);
			if (length>1) {
				returnedArray[1] = (byte) ((packedMsg & 0xFF00) >> 8);
				if (length>2) {
					returnedArray[2] = (byte) ((packedMsg & 0xFF0000) >> 16);
				}
			}
		}
		return returnedArray;
	}

	public int getLength() {
		try {
			return getDataLength(packedMsg & 0xFF) + 1;
		} catch (InvalidMidiDataException imde) {
			// should never happen
		}
		return 0;
	}

	public void setMessage(int status) throws InvalidMidiDataException {
		// check for valid values
		int dataLength = getDataLength(status); // can throw InvalidMidiDataException
		if (dataLength != 0) {
			super.setMessage(status); // throws Exception
		}
		packedMsg = (packedMsg & 0xFFFF00) | (status & 0xFF);
	}


	public void setMessage(int status, int data1, int data2) throws InvalidMidiDataException {
		getDataLength(status); // can throw InvalidMidiDataException
		packedMsg = (status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);
	}


	public void setMessage(int command, int channel, int data1, int data2) throws InvalidMidiDataException {
		getDataLength(command); // can throw InvalidMidiDataException
		packedMsg = (command & 0xF0) | (channel & 0x0F) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);
	}


	public int getChannel() {
		return packedMsg & 0x0F;
	}

	public int getCommand() {
		return packedMsg & 0xF0;
	}

	public int getData1() {
		return (packedMsg & 0xFF00) >> 8;
	}

	public int getData2() {
		return (packedMsg & 0xFF0000) >> 16;
	}

	public int getStatus() {
		return packedMsg & 0xFF;
	}

	/**
	 * Creates a new object of the same class and with the same contents
	 * as this object.
	 * @return a clone of this instance.
	 */
	public Object clone() {
		try {
			return new FastShortMessage(packedMsg);
		} catch (InvalidMidiDataException imde) {
			// should never happen
		}
		return null;
	}

} // class FastShortMsg

